143 lines
3.1 KiB
Go
143 lines
3.1 KiB
Go
// Copyright 2017 AMIS Technologies
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package container
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"sync"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/network"
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"github.com/docker/docker/client"
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)
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const (
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FirstOctet = 172
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SecondOctet = 19
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NetworkName = "testnet"
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)
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type DockerNetwork struct {
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client *client.Client
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id string
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name string
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ipv4Net *net.IPNet
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mutex sync.Mutex
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ipIndex net.IP
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}
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func NewDockerNetwork() (*DockerNetwork, error) {
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c, err := client.NewEnvClient()
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if err != nil {
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return nil, err
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}
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for i := SecondOctet; i < 256; i++ {
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// IP xxx.xxx.0.1 is reserved for docker network gateway
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ipv4Addr, ipv4Net, err := net.ParseCIDR(fmt.Sprintf("%d.%d.0.1/16", FirstOctet, i))
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networkName := fmt.Sprintf("%s_%d_%d", NetworkName, FirstOctet, i)
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if err != nil {
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return nil, err
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}
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network := &DockerNetwork{
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client: c,
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name: networkName,
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ipv4Net: ipv4Net,
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ipIndex: ipv4Addr,
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}
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if err = network.create(); err != nil {
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log.Error("Failed to create network, retry...", "err", err)
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} else {
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return network, nil
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}
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}
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return nil, err
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}
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// create creates a docker network with given subnet
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func (n *DockerNetwork) create() error {
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ipamConfig := network.IPAMConfig{
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Subnet: n.ipv4Net.String(),
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}
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ipam := &network.IPAM{
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Config: []network.IPAMConfig{ipamConfig},
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}
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r, err := n.client.NetworkCreate(context.Background(), n.name, types.NetworkCreate{
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IPAM: ipam,
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})
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if err != nil {
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return err
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}
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n.id = r.ID
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return nil
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}
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func (n *DockerNetwork) ID() string {
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return n.id
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}
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func (n *DockerNetwork) Name() string {
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return n.name
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}
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func (n *DockerNetwork) Remove() error {
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return n.client.NetworkRemove(context.Background(), n.id)
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}
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func (n *DockerNetwork) GetFreeIPAddrs(num int) ([]net.IP, error) {
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n.mutex.Lock()
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defer n.mutex.Unlock()
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ips := make([]net.IP, 0)
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for i := 0; i < num; i++ {
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ip := dupIP(n.ipIndex)
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for j := len(ip) - 1; j >= 0; j-- {
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ip[j]++
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if ip[j] > 0 {
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break
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}
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}
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if !n.ipv4Net.Contains(ip) {
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break
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}
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ips = append(ips, ip)
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n.ipIndex = ip
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}
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if len(ips) != num {
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return nil, errors.New("insufficient IP address.")
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}
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return ips, nil
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}
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func dupIP(ip net.IP) net.IP {
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// To save space, try and only use 4 bytes
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if x := ip.To4(); x != nil {
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ip = x
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}
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dup := make(net.IP, len(ip))
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copy(dup, ip)
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return dup
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}
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